Connected headset to pilot jacks, and RS232 DB25 pins 7 & 8 to V16 serial Tx and Rx wires. Connected iEFIS panel to frame. Powered up radio and Razor head. Programmed several frequencies in the head. Setup Explorer EFIS to communicate with radio. Cycled power and tested control from EFIS while observing remote head output. Successfull in verifying EFIS radio control using the iEFIS airport navigation frequency library.